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CombinationSum.cc
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38 lines (32 loc) · 1.15 KB
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// https://oj.leetcode.com/problems/combination-sum/
namespace CombinationSum {
class Solution {
public:
void doCombinationSum(vector<int> &candidates, int target, vector<int> &cur, int pos, int curSum, vector<vector<int> > &res) {
if (curSum > target) {
return;
}
if (curSum == target) {
res.push_back(cur);
return;
}
for (int i = pos; i < candidates.size(); i++) {
cur.push_back(candidates[i]);
curSum += candidates[i];
doCombinationSum(candidates, target, cur, i, curSum, res);
cur.pop_back();
curSum -= candidates[i];
}
}
vector<vector<int> > combinationSum(vector<int> &candidates, int target) {
vector<vector<int> > res;
if (candidates.empty()) {
return res;
}
sort(candidates.begin(), candidates.end());
vector<int> cur;
doCombinationSum(candidates, target, cur, 0, 0, res);
return res;
}
};
}